[time-nuts] HP/Agilet counter 53131A (not 53151A) trigger problems
djl at montana.com
Mon Aug 27 15:31:25 EDT 2012
Isn't crystal aging marked by random jumps? perhaps lattice
rearrangement? Really hard if not impossible to model...
> 30mV are -13dBm so maybe it is why the -20dBm is not a suitable level
> that input. I have the 53132A and the 53181A so I can test (with the R&S
> SML01). Is this problem new? Never tested before?
> About the OCXO aging: OK, I'm interested in the development of a model
> can be general enough so that it can be "steered", adjusting its
> parameters, during the OCXO life. The data (to adjust the parameters)
> be gathered by the continuous monitoring with the GPS.
> On Mon, Aug 27, 2012 at 7:01 PM, Bernd Neubig <bneubig at t-online.de>
>> Hi Azelio,
>> Sorry, the counters are 53131A, not 53151A. The A and B inputs are
>> from DC to 225 MHz with a sensitivity of y20 mV (rms) up to 100 MHz,
>> <30 mV
>> (rms) 100 ~ 200 MHz, and <50 mV (rms) 200 ~ 225 MHz.
>> The problem can be at either input alone. The problem is only in the
>> between 100 MHz and <200 MHz, observed in automatic trigger mode. In
>> trigger mode the counter does not trigger at all in that freq range.
>> I cannot tell you an aging model for a particular OCXO, and I doubt if
>> anyone can ;) Aging predictions can only be made on individual OCXO,
>> unit, and the prediction is only valid over a rather limited time.
>> you must continuously monitor and update your prediction.
>> Best regards
>> -----Ursprüngliche Nachricht-----
>> Von: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] Im
>> Auftrag von Azelio Boriani
>> Gesendet: Freitag, 24. August 2012 17:28
>> An: Discussion of precise time and frequency measurement
>> Betreff: Re: [time-nuts] HP/Agilet counter 53151A trigger problems
>> From the datasheet:
>> A input 10Hz..125MHz min level 25mVrms (-19dBm) B input min 50MHz,
>> the problem is on A input only? Maybe 150MHz for the A input, being
>> the official specifications, requires more signal on one counter than
>> other. In the past they all were fine?
>> I have read your paper on the correlation between the real and
>> aging of crystal oscillators. I'm trying to find a suitable model for
>> Morion MV201 OCXO or the Oscilloquartz 8663 to implement a Kalman
>> On Fri, Aug 24, 2012 at 3:34 PM, Bernd Neubig <BNeubig at t-online.de>
>> > Hi all,
>> > I have several HP/Agilent frequency counters 53151A (and 53152A) in
>> > Several of them meanwhile show trigger problems.
>> > I have tested the A and B channel between 5 MHz and 200 MHZ at three
>> > input levels of -10 dBm, 0 dBm and +10 dBm.
>> > Those with trigger problems show erroneous numbers at -10 dBm input
>> > level rather selectively, i.e. mostly at 100 MHz, some also at 150
>> > MHz, while the are o.k.
>> > Has anyone on this list experienced similar defects and can give a
>> > recommendation how to fix/repair them?
>> > Best regards
>> > Bernd
>> > DK1AG
>> > www.axtal.com
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